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Improved Rotary Engine, The French Government as a Manufacturer and More

The Hecker and Waterman Experiments

Miscellaneous Summary

Photographic Items

Clumsy Packing Rings

The Products of Combustion for Motive Power

Experiments With Tools Needed

Mr. Jerome's Yacht

The Year 1863

Philosophy in a Cup of Tea

Recent American Patents

Patent Claims

Issued From The United States Patent-Office


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  • New Books and Publications

  • Notes and Queries

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